a tv documentary. >>> president obama is among the dozens of world leaders traveling to south africa for nelson mandela's memorial service tomorrow. the president, former president george w. bush, and their wives leave aboard air force one this morning for johannesburg. >> reporter: a vigil for the father of the nation. since news of nelson mandela's death broke, south africans have flocked to his house around the clock to pay their final respects. >> he was a hero. >> reporter: across the country, south africans are comforting themselves and each other by embracing mandela's spirit of love and devotion. >> i came to pay my last respects to our father. he's everything. >> to keep his legacy going we need to keep living what he set out for us. >> it is so special. beautiful. >> reporter: mandela was remembered with a national day of prayer and reflection. ex-wife winnie mandela joined south africa's president, jacob zuma, at a church service. >> for all of us, the nation and friends of south africa of madiba come together to pray for him. >> reporter: at another service, mandela's gre